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// ------- Preamble ------- //
#include <avr/io.h>
#include <util/delay.h>       /* Time delay function */

int main(void) {

	// ------- Inits ------- //
	DDRB = 0b11111111;	/* Port-B configured for output */
	uint8_t i;			/* unsigned 8-bit integer */
	
	// ------- Event loop ------- //
	while(1){
		
		for (i=0; i<6; i++){
			PORTB = 0b00000001 << i;
			_delay_ms(500);
		}
	}	
	return(0);			/* this line is never reached */
}